Average radial velocities as a function of distance from the centre of the cluster (as defined by Mackey & Gilmore 2003). Black points show average velocities of the RSGs with RV estimates from Table 1, and blue squares show OBA-type stars from Evans et al. (2006). The black solid line and blue shaded region illustrate the systemic velocity and velocity dispersion of the cluster estimated using a combination of RSGs and OBA-type stars (153.7 ± 3.2 km s⁻¹; where the uncertainty quoted and displayed here is the σ_1D measured in Sect. 3.1). The black points with the largest uncertainties are those with only MUSE data.